package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * @BelongsProject: sky-take-out
 * @BelongsPackage: com.sky.service.impl
 * @Author: song
 * @CreateTime: 2023-12-28  09:41
 * @Description: DishService具体实现
 * @Version: 1.0
 */

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据
        dishMapper.insert(dish);//后绪步骤实现

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);//后绪步骤实现
        }
    }

    /*
     * @description:菜品的分页查询
     * @author: song
     * @date: 2023/12/29 15:57
     * @param: [dishPageQueryDTO]
     * @return: com.sky.result.PageResult
     **/
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /*
     * @description:菜品的批量删除
     * @author: song
     * @date: 2023/12/29 15:58
     * @param: [ids]
     * @return: void
     **/
    @Override
    public void deleteBatch(List<Long> ids) {
        // 判断菜品是否属于起售状态，若是属于起售状态，则不允许删除，抛出异常
        for (Long id:ids){
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE)
                throw  new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
        }
        // 判断菜品是否与相关套餐有所关联。
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null || setmealIds.size() > 0)
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        for (Long id : ids){
            // 删除菜品
            dishMapper.deleteById(id);
            // 删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }
    }
    /*
     * @description:根据菜品id查询菜品相关信息具体实现
     * @author: song
     * @date: 2024/1/2 10:00
     * @param: [id]
     * @return: com.sky.vo.DishVO
     **/
    @Override
    public DishVO getByIdWithFlaver(Long id) {
        Dish dish = dishMapper.getById(id);
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }
    /*
     * @description:修改菜品信息
     * @author: song
     * @date: 2024/1/2 10:07
     * @param: [dishDTO]
     * @return: void
     **/
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        // 修改菜品的基本信息
        dishMapper.update(dish);//TODO
        // 删除原有的口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        // 重新插入口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors.size() > 0 && flavors != null){
            flavors.forEach(flavor ->{
                flavor.setDishId(dishDTO.getId());
            });
            // 向口味表中插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }
    /*
     * @description:根据分类id查询菜品
     * @author: song
     * @date: 2024/1/2 14:16
     * @param: [categoryId]
     * @return: java.util.List<com.sky.entity.Dish>
     **/
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder().categoryId(categoryId)
                .status(StatusConstant.ENABLE).build();
        return dishMapper.list(dish);
    }
    /**
     * @description:条件查询菜品和口味
     * @author: song
     * @date: 2024/1/10 10:15
     * @param: [dish]
     * @return: java.util.List<com.sky.vo.DishVO>
     **/
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
    /**
     * @description:菜品的启停起售
     * @author: song
     * @date: 2024/1/10 16:43
     * @param: [status, id]
     * @return: void
     **/
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.update(dish);
    }

}
